Virtualmin GPL/Debian Jessie to Virtualmin GPL/Debian Stretch - Guide?

Hi all

Is there a guide somewhere? I see the Wheezy to Jessie guide, but am aware of the change from MySQL to Maria for example and figured that there must be something else to be aware of that isn’t covered in that guide.

I think my preference is to backup the list of installed packages, my Virtualmin config/sites and then fresh install Stretch, but I am not 100%

Has anyone done this?